Home of America’s First Hydronic (FHW) HeatingAPPLIANCE!

U.S. Patent 10,690,356 – Canada to follow

Boilers On Demand LLC replaces costly, skilled technician built-on-site, Hydronic (Forced Hot Water) Heating Installations with a self-contained, performance-optimized, U.S. Patented APPLIANCE!

Locate our fully integrated, free-standing, application-specific Appliance comprising over 95% of a typical system installation value and complete connections to your existing (or proposed) piping and wiring. A typical day-cycle, lesser-skilled install provides dramatic material, labor and space reductions with guaranteed, superlative performance. Our Appliance is also Oil or Gas Burner-fired, at your option!

Are you impressed or intimidated by seemingly complex hydronic heating systems? Don’t be! All that superfluous “pretty piping and wiring” that we refer to as “The Plumber’s Playground” actually increases your system energy load and reduces its performance! A SIMPLE TEST: Place an Electrical Watt-Meter on your heating circulation circuit. Our Appliance typically consumes only 8 to 13 watts total while heating! Compare this with 80+ watts minimum per circulator + valving + controls + additional flow resistance (head pressure) of any contemporary system.

Patented enhanced natural convection piping provides continuous “gravity-assisted heating” of DHW (with IWH Option) and reduced area heating under selective fail modes ….. it just keeps on heating!

PLEASE NOTE: Total Heating Performance is the AGGREGATE of Boiler AFUE, Distribution and Radiation Efficiencies!

Our “Neo-Gravity Hydronic Convection Heating Appliance™” optimizes Forced Hot Water Heating —– it’s just “Naturally Efficient”!

Ask about our“Delta-T Club” for the lowest heating costs of ANY Fuel!


Our super-heavyweight cast-iron/steel/brass/bronze appliance construction historically suggests a minimum economic life of 30+ years — twice or more that of any typical “low-mass”, “condensing” or “on-demand” heating system, and at a lower appliance-driven installed cost. Buy two of theirs to one of ours? Observed fuel savings are typically 25% to 50% or more, depending upon prior system configuration, distribution and radiation characteristics.    Lowered system operating temperature minimizes power consumption, burner cycling  and maintenance levels. In fact our multiple, monitored “beta site” installations have now accrued over thirty (30) system-years of flawless operation, i.e. no system-related service calls!


1. Check any boiler manufacturer’s water condition warranted demands ….. VERY CAREFULLY! Then compare it with Weil-McLain’s UO Series Boiler Warranty, the “building block” of our All Malleable-Cast-Steel Constructed Appliance. No “Magnetite Alleviation” or “Return Water Tempering” issues with this super-heavyweight, naturally scavenging Weil-McLain UO cast-iron boiler – this “beast” is built to last!

2. Try this: Divide the Cost of a Boiler by its Shipping Weight to determine its approximate Cost per Pound. The Weil-McLain UO is 1/2 to 2/3rds that of ANY American or Foreign Boiler! Now, just what are you paying for – durability or ….. ???

DISCLOSURE: Taco Comfort Solutions® has provided us with direct Delta-T ECM application development support. Thank You!

Our Hydronic Heating Appliance, tailored for your application, is available directly to both Consumers and Trade Personnel alike.

Check out our Cost Estimator.

Future Dealer Licensing Inquiries are also welcomed.

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 Our Slogan: “We put ‘Automatic Transmissions’ on Boilers!“™

New Website Items (hyperlinked):

  1. Finally, after four years, U.S. Patent 10,690,356 issued 06/23/2020 —– linked above.
  2. ….. and the new HTP Superstor® Ultra MAX Indirect Water Heater is now standard on all our systems! (See Video Link)
  3. Our Recent Blog: “OIL HYDRONIC HEATING IS CHEAPEST – For The “Smart” Consumer”.
  4. CUSTOMER NOTE: Updated User’s Guide for your Delta-T ECM Hydronic Heating Appliances.
  5. Our Commentary on: “The 2019 Annual Boiler Report” – Reading Between the Lines
  6. JUST PUBLISHED: A Trade-Practice Challenging Article, “Gravity Convection Heating Distribution Revisited”
  7. Our Published Trade ArticleIntroducing a True Delta-T ECM Hydronic Heating Appliancein ACHR News December 10, 2018!
  8. See our latest Heating Blog: “Heating a Church – Warming up the Congregation”
  9. New in The Heating Blog: BIOHEAT® – “What shade of green” energy? An overview of Bioheat® and its implications.
  10. We are now also on Google Business!
  11. “In The Media” Button – Our Feature Article “Beyond AFUE Toward Delta-T Hydronic Heating System Efficiency” as published in “Plumbing Engineer” May, 2016
  12. Announcing our Multi-Boiler (Oil) Systems, built on our standard High-Mass Weil-McLain UO Series Boiler Modules with Taco OOe Series Delta-T ECM Circulator Boiler & Distribution Loops. Perfect for upscale residential, light commercial and high risk applications!
  13. NEW: YouTube Introduction Videos on our Premier Suppliers! Weil-McLain, Inc., Taco Comfort Solutions & HTP.

Check out our Products, Services and FAQ then Contact Us for more details.  We are Taco Engineering acknowledged experts at providing Packaged DELTA-T Hydronic (Forced Hot Water) Heating System solutions.

Also SEARCH The Heating Blog on this site for further general and specific heating information.


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